6mm ARC vs 243 Win. Validating comparable data from my rifles only. 

.243 is incredibly underrated, as are a few other calibers - love this sir

I have new respect for the 243, going to build one:)

Need a bolt gun for the ARC for this to make sense. The new Hornady bolt gun data has a max pressure of 62,000 PSI for the ARC compared to 60,000 PSI in the 243. You can use less powder and about match the two rounds with equal barrel length and bullet weights with less powder in the ARC.

Godbless you too sir for sharing your experience.

Very interesting Dave. Thanks for sharing! God Bless.

Good job, thanks for the comparison.

Even adding 100fps, maybe, with 4 extra inches of barrel, the ARC is definitely a valid option for most use cases. Put it in a mini mauser, run it at 65k and give it a longer barrel due to the shorter action and it is every bit the gun of the vanguard and probably a little lighter.

Excellent info, thanks.

Considering the difference in case capacity, it’s pretty impressive how efficient the 6 mm ARC is. I’ve heard you can load it hotter in a bolt gun, which would put it even closer to the 243.

Another good video. Really nice shooting. Take care.

Great video series. I‘ve built 2 6ARCs over the past few months. Both M4E1 lowers and uppers, one an 18” BA 1:7 and the other a 22” Shaw 1:7.5. Both use the BA bolts, JP Heavy SCS, Raptor CH, TriggerTech Diamond Flat Bow, Radian ambi-saftey. 18” has a 15” Sgt of Arms ARCA hand guard, the 22” has a 17.5” Sgt of Arms ARCA hand guard. Both have a SS ECTunerbrake, A2 tube and PRS Gen3 stock. 18” has a cantilever mount by Swampfox with their 1-10x LVPO and the 22” has a Warne Skyline 20MOA cantilever mount with a Vortex Razor HD Gen2 4.5-27x56. Both are amazingly accurate, pleasurable to shoot, and a lot of fun. The 18” is my main go-to for most situations out to ~800, the 22” for anything beyond that. Load data both seem to love is slightly higher than max for gas guns, but not dangerously so. I clean & anneal between every firing, trim to 1.490 and chamfer/deburr. GM205M/CCI400/CCI41 all seem to be equal. LeverEvolution or CFE223 at 30.00g, auto-trickle to .01 grain accuracy, using Hornady ELDM 108g, Sierra MK107, and Hornady ELDx 103g for hunting, all seated to .080’ from the lands puts me at 2.260” COAL, and feed in my ARStoner 15rd mags flawlessly. I did polish the M4 Feedramps with a felt dremel with Jewelers rouge, and a bit of JB BORE Paste to clean up the tooling marks and leave a mirror finish. Both rifles shoot under 1/2MOA to 845yds, which is as far as I’ve taken them. The 22” shoots them average around 2950. The 18” averages around 2715. Seems the best velocity comes from CFE223 and LeverEvolution. AA2520 is also accurate among others similar in burn rate. I might swap a Vortex Razor HD Gen3 6-36-56 MRAD I have on another rifle to the 6ARC bolt gun I am building. Remington Model 7 LSS in 300SAUM. PTG sells a fine bolt for the PPC-style cases we use for it for ~$200, Putting an MDT chassis on it with a 26” Kreiger or K&P depending on what I choose to go with. www.kandpgunco.com/price-list/4959357 Great series!

Very interesting, thank you very much🐘🪖🇺🇸

This is the comparison I have been wanting to see. Not suprised to see the bolt .243win shot the best..... Nice demonstration thank you

Nice comparison.That bolt gun is so nice looking.

You could send Junior out after coyotes with the Camilla and he'd have a grand old time! I like the sling on the ARC. You really have a nice place to shoot there. Looks like you could easily stretch it out to 1000 yards, if you desired. Thanks for posting on YT.

Thanks

Not an apples to apples comparison but a DAMN fine backdrop you have sir!

Came back to this video for research purposes, great comparative video btw! I'm building a POF Revolution DI in 6mm Creedmore with a 20" light contour Lilja barrel. I'm shooting for >2900fps with the 109 eldx in a 7 pound rifle. Planning on all around rifle from varmints to deer and some competition.

Gret video. I'm thinking about getting the Ruger American Gen II in 6mm ARC.

Looks like you had an awesome birthday. Keep it up

6mm Creedmoor offers the powder capacity of the .243 and 110-115 bullet weights of the ARC.

Excellent video Dave , i reckon you would have got a lot more velocity out of the 243w if it's barrel was 24 inch as well ... the 6mm does a good job tho , I wouldn't hesitate to take it on a hunt.

Good job 👍

Well done brother

That 243 is a shooter!

Great video! I'm surprised that chrony attached to the barrel doesn't fuck up your harmonics)accuracy?

I think you could try the 100 gr Sierra again for the 243 - if you watch your magnetospeed, it's slowly creeping toward the muzzle with each shot. I love my magnetospeed, but I don't shoot groups when attached. Thanks for the vid! a 6mm ARC is on my radar.

I'll take the 243

Dang that Weatherby shoots! And those are impressive speeds for a 20 inch 243. The ARC is pretty close for being a much smaller case. Plus you have the added benefit of fast follow up shots with the AR platform.

Good video

Interesting video! Thank you for the comparison. What is the twist rate in the 243? I know the 6mm arc is 1in 7.5. The 95g SST in the 243 did an outstanding job! Isn’t the SST a hunting round? It would do a good job in either rifle.

Arc had a 5 gr heavier bullet than the 243 I was still empress I’ve been shooting my arc since oct 2020 Very satisfied with it

Checked out the 6mm arc because of your videos. Ammo is so darn expensive though. What would you hunt with the ARC?

GOOD SHOOTIN!

If you’re gonna go with a bolt gun edge goes to .243 win. If you want .243 performance out of an AR 15 platform go with 6mm ARC

I wonder how much the wind affected the group size.

I have always liked little efficient cartridges. Rounds such as .221 FB from way back have always tickled me with what is capable from small powder charges. My family would say this is because I am cheap. Oldest of 8 and father of 7, I say "thrifty". With the 6 ARC what is your take on the bolt strength commentary regarding case head size?

Was you using CFE-223 in the ARC. Vert nice by the way.

I would like to have the load day you have on the 243 with the SST

A 24 inch barrel on the .243 with the 95 grain projectiles would have gotten around 3050 fps. So quite a bit of difference if you compare apples to apples. Where the ARC shines is with the long, heavy projectiles because of its twist rate. And of course lower recoil and less powder. I'm still waiting for those darn bolt action ARC rifles to become available. I don't want it in an AR platform. Savage appears to be the only one that chambers for the ARC. but they are impossible to find. Come on Ruger, what the hell are you waiting for???

I’m thoroughly impressed with the 6mm a shorter cartridge same bullet weights pretty much moves out right around the same FPS tbh it is absolutely a better round especially since it was designed for ar style rifles and military use should make it extremely popular across hunting and sporting applications making this new ammo cheaper over time

I would have exacted a much greater velocity difference. The 6mm ARC appears to be a very efficient cartridge. The difference in barrel length might account for 50 FPS.

Looks like you had a flyer one the ARC 100 Gr.

Good data. What was the range?

Fast-forward to 2023... 243 ammo still available and **relatively** affordable. 6mm Arc, unavailable and costs way more than 243 if you can even find it. 243 wins.... again.

out of the same lenght barrel the 243 win has %6-7 more energy from the muzzle. but the arc with a longer bc bullet at 200 yards they match each other in energy, around 400 yards the 6 arc surpasses the 243 win having %6-7 more energy. bullet drop is less then a 1" difference between each other almost negligible. the fact they got a cartridge this good in an ar-15 platform astounds me. its basically a modern 243 Winchester with better long range performance and wind drift.

Give the .243 the 4" and it's not really close. My Savage .243 gets 3100 single sd/especially and 3015 with same 105 bthp all with a 22" barrel. You all can keep the arc and creeds.they are just a new bandwagon rolling through. I'll rebarrel before to a faster twist if I feel the need.

I believe I'll stick with the 243

Ill take the .243 first its old and Proven and you just showed everybody. Thanks

Since I don’t load ….I assume the 243 would be a better choice …given the cost of the 6mm ARC…is that assumption correct??? 243 is considerably cheaper. I hunt coyotes and p-dogs.

I would not want to be an antelope or mulie anywhere near you and that Weatherby in 243 Win!

You were shooting the six mm after the wind had picked up a bunch

95 sat shoots in .the .3s .4s in one of my barrels

Forgot your eyes on the ARC shooting. Safety first Dave!

This test is totally invalid brother. You used a neutered 243 by only running a 20 inch barrel. The 243 was designed to run 24+ inch barrels. Anything less than that and the powder is just burned up and wasted outside of the barrel. Yes lots of people run the shorter 243 barrels in compact and youth guns but to get a 243 to really perform it needs to have the length barrel on it that it was designed for. You run a 24inch barrel on that 243 and you’ll see the velocity will be at least 300+ fps faster than the 6mm ARC. Don’t get me wrong I love the little ARC and Grendel both ( I have both in ARs and Bolts), but they will never be a 243 in the field, never…..regardless of what ballistic charts show!👍

1:20 lol designed by women for Wetherby. XD

Godbless you too sir for sharing your experience.